Fix yolov3-tiny mask

Bartek Gąsiorzewski

2018-05-07 74956888d1d9eafded7140ad7821b4b39c863756

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/